**Alexander Vinogradov 1, Vadim Bolshev 1,\* , Alina Vinogradova 1, Michał Jasi ´nski 2,\* , Tomasz Sikorski <sup>2</sup> , Zbigniew Leonowicz <sup>2</sup> , Radomir Go ˇno <sup>3</sup> and El ˙zbieta Jasi ´nska <sup>4</sup>**


Received: 24 April 2020; Accepted: 27 May 2020; Published: 29 May 2020

**Abstract:** This paper presents the analysis of power supply restoration time after failures occurring in power lines. It found that the power supply restoration time depends on several constituents, such as the time for obtaining information on failures, the time for information recognition, the time to repair failures, and the time for connection harmonization. All these constituents have been considered more specifically. The main constituents' results values of the power supply restoration time were analyzed for the electrical networks of regional power supply company "Oreolenergo", a branch of Interregional Distribution Grid Company (IDGC) of Center. The Delphi method was used for determining the time for obtaining information on failures as well as the time for information recognition. The method of mathematical statistics was used to determine the repair time. The determined power supply restoration time (5.28 h) is similar to statistical values of the examined power supply company (the deviation was equal to 9.9%). The technical means of electrical network automation capable of the reduction of the power supply restoration time have also been found. These means were classified according to the time intervals they shorten.

**Keywords:** power supply restoration; power supply outages; failures; time intervals; obtaining information; information recognition; connection harmonization
